I use this pressure suit: Dainese "Jacket Wave Pro 2". killer. full deep back, full chest, shoulder, elbows, and kidney, all CE. probably now near the prices I'm seeing your other options.. got this first year and was steep. I use it under my KLIM Badlands, (which also has kidney), as this protection much stronger IMHO than the stock KLIM.. so i removed the stock, yellow KLIM jacket pads, and use this under. Still looking at Leatt.. but would be fine over top... of jacket.

I the a8 is way more comfortable and more protective than the Knox and much lighter more comfortable the the bionic though probably just slightly less protective. I also wear a leatt and it works perfectly w/ the a8

Personally, in cooler weather I will probably still wear the bionic , but when temps are high you just cook in the thing. When it's hot, the a8 will be on.

I am very fussy about gear and have to give the a8 two thumbs up.

The only think I would point out is that it runs small. I am a consistent 44 chest (or xl shirt) and typicall 34 jeans (or size L) and I went with the 2xl - 4xl and it fits me perfectly.

Let me know what questions you have as I know there not much info out there on the a8.